They started out as friends. Now, Life & Style has learned, Justin Theroux and Selena Gomez's relationship has taken an unexpected turn into something more serious. "They've known each other for years through their manager," a source explains. "Initially, they leaned on each other for emotional support after going through messy breakups." Justin announced his split from wife Jennifer Aniston in February while Selena parted ways — again — with pop star Justin Bieber in March. (Photo Credit: Getty Images) In recent weeks, though, "they've become closer than ever," says the source. "It's turned into something more than friendship." Despite a 21-year age difference, says an insider, "Selena and Justin are falling for each other." Friends think that’s a mistake — and warn that if Justin and Selena become a full-fledged couple, it will end badly. Selena, Justin and Jen all share the same manager, Aleen Keshishian — and Jen, who views Selena...